Validation of a novel online depression symptom severity rating scale: the R8 Depression

Area of Science:

• Psychiatry
• Digital Health
• Psychometrics

Background:

• An automated web-based system, Psynary, aids clinicians in managing mood and anxiety disorders.
• It utilizes standardized outcome measures for symptom assessment and treatment optimization.
• This study validates the R8 Depression scale within the Psynary system.

Purpose of the Study:

• To assess the validity of the R8 Depression scale, a core outcome measure of the Psynary system.
• To analyze data from parallel studies conducted in New Zealand and Japan (OptiMA-1 NZ and Japan).

Main Methods:

• Recruited clinical samples from secondary care and private psychiatry clinics.
• Administered the R8 Depression scale and Patient Health Questionnaire (PHQ-9) via the online Psynary system.
• Assessed internal validity using Cronbach's alpha and Guttman's lower bounds; external validity against PHQ-9 and QIDS-SR16 using correlation coefficients.

Main Results:

• 270 patients provided 1124 assessments; 1053 included PHQ-9 completion.
• Internal reliability scores for the R8 Depression scale exceeded 0.9.
• Strong external validity was observed with a correlation of 0.91 against the PHQ-9 for combined samples.

Conclusions:

• The R8 Depression scale, administered via the Psynary online system, is a validated patient-rated outcome measure.
• It exhibits high internal and external validity when compared to widely used depression scales.
• Further research is ongoing to evaluate its sensitivity to change.